The crop ratio settings are default to the app settings and cannot be modified. You may share your feedback here Photoshop Family Customer Community so that Engineers can look into this.
You don't have to do the Autosync or copy thing.
After import go to Previous Import.
Go to Library grid mode
Do Command-A to select all the photos.
Select the Crop you want
Takes a few seconds.
Personally, I don't want to discard pixels all the time so I like "as shot"
The default crop ratio IS "as shot". It cannot be changed. And, really, I don't think you would want it to. It would be rather haphazard to let Lightroom decide which part of the image to crop, don't you think?
haphazard to let Lightroom decide which part of the image to crop
But I have had situations where I want ~100 images cropped to a ratio to suit a projector with 'all images full screen' slideshow.
I must (and do!) review every image to check that I have not cropped away important parts of any image.
So using Auto-Sync the Crop does save many, many mouse clicks in the Develop/Crop module for multiple photos. A quick scroll through the images in Loupe view to check them is much faster.
Even if I Auto-sync the crop, I still have some control on how I place the crop (in the viewed photo) knowing the typical subject matter in the images. eg. I might crop to the lower portion of the frame if I know I can lose some sky in all the photos.